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Repurchase Agreement Borrowings Repurchase Agreement Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2017
Transfers of Certain Financial Assets Accounted for as Secured Borrowings [Abstract] |
Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table Text Block] | The following table presents the carrying value of Park's repurchase agreements by remaining contractual maturity and collateral pledged at December 31, 2017 and December 31, 2016:
|  | December 31, 2017
(In thousands) |  | Remaining Contractual Maturity of the Agreements
|  | Overnight and Continuous |  | Up to 30 days |  | 30 - 90 days |  | Greater than 90 days |  | Total
U.S. government and agency securities |  | $ | 182,185 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,104 |  |  | $ | 183,289 |
|  | December 31, 2016
(In thousands) |  | Remaining Contractual Maturity of the Agreements
|  | Overnight and Continuous |  | Up to 30 days |  | 30 - 90 days |  | Greater than 90 days |  | Total
U.S. government and agency securities |  | $ | 208,691 |  |  | $ | — |  |  | $ | — |  |  | $ | 301,104 |  |  | $ | 509,795 |

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- Definition Transfers of Certain Financial Assets Accounted for as Secured Borrowings [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the carrying amount and classification of assets and liabilities recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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